I actually just tried this, all I had to do was flip the Hero's battery upside down and drop it in...works....I didnt have to make any mods

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Thanks for the info i just tried it with the TP2 and Evo and it does fit in the Shift you just have to flip it over for the connectors. So it would make sense that all the HTC smartphone batteries on (sprint) would fit just one side or another depending on where the connectors are.

Sweet, I'll be holding onto my Hero battery then just in case I need a backup for when I'm on the go, I've actually read on several other websites that no real modification is required and that the battery works perfectly fine without any issues. It's beginning to look as if the Shift 4G is going to be my next phone, yet I'm still teetering on the Epic 4G due to the really nice 4 inch super amoled screen, but the 2.2 out of the box mixed with a better (in my opinion) keyboard may cause me to side with the EVO Shift.